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It claims that its patented molecules protect hair, fighting frizz and boosting volume.

Upscale: Living Proof is a premium line of haircare, famous for its frizz-fighting properties. An 8oz bottle of shampoo costs $24

Since the company was founded in 2004 by MIT professor and biotech inventorDr Bob Langer, its products have been feted by Dr Oz and Oprah.

Friend forever: Ms Aniston made the 'Rachel Cut' famous in the Nineties

According to the Living Proof website, he 'discovered that, for both hair and skin products, the beauty
industry has relied on the same off the shelf ingredients, most of them
far too ineffective to make any real, long lasting impact.

'This inspired
our founders to create new technologies that would offer women "proof
in a bottle," rather than "hope in a bottle."'

Ms Aniston, who this week unveiled her huge engagement ring from Justin Theroux for the first time, also fronts campaigns for SmartWater.

A recent video released by the brand saw her poke fun at the rumours that surround her, by pretending to be pregnant with triplets and that her famous hair is merely a wig, masking shorter, frizzy locks.